What is CVE-2025-66737?

CVE-2025-66737 is a medium-severity vulnerability in Yealink Sip-T21\(p\)e2, classified under Relative Path Traversal. CVSS score: 4.3/10. Published 2025-12-26.

How severe is CVE-2025-66737?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Path Traversal in Yealink Sip-T21\(p\)e2

CVE-2025-66737

Yealink T21P_E2 Phone 52.84.0.15 is vulnerable to Directory Traversal. A remote normal privileged attacker can read arbitrary files via a crafted request result read function of the diagnostic component.

EPSS: 0.006 (46.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Yealink Sip-t21\(p\)e2
Yealink Sip-t21\(p\)e2_firmware — versions 52.84.0.15
N/a — versions n/a

Weakness classification (CWE)

CWE-23 — Relative Path Traversal

References

cve@mitre.org (Product)
cve@mitre.org (Exploit)

Frequently asked questions

What is CVE-2025-66737?: CVE-2025-66737 is a medium-severity vulnerability in Yealink Sip-T21\(p\)e2, classified under Relative Path Traversal. CVSS score: 4.3/10. Published 2025-12-26.
How severe is CVE-2025-66737?: Medium severity. CVSS v3 base score is 4.3 out of 10.